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[Q] i9505 "no signal" after 4.42 Google ROM upgrade

Hi,
I own a GS4 - i9505G - with google ROM edition v 4.3.
yesterday I tried to upgrade the ROM to 4.42 (Google ROM clean version without any tweaks, found here: http://forum.xda-developers.com/showthread.php?t=2341026).
After the upgrade, the UI & ROM seem to work fine but I have no carrier signal.
When I perform the mobile networks operators' search I can see all networks and by clicking "Choose automatically" I managed to renew the signal. However, after a very short while the signal is lost again (manual joining to the network does not work at all).
I searched and found this thread: http://forum.xda-developers.com/showthread.php?t=2192025
and this lead me to use ODIN and flash the modem (twice, as recomended).
I used the modem file exactly for my phone base version which is: XXUBMH1.
However, even after flashing twice - still no signal....
Since I had Nandroid backup (always VERY highly recommended) I returned to the original 4.3 ROM version and then everything worked fine.
I also made another try to identify the issue and installed the 4.42 Google ROM edition which is not the Google clean original version and performed a factory wipe and cleaning everything
(this time the ROM I used was downloaded from here: http://forum.xda-developers.com/showthread.php?t=2557353).
However, same story and no signal....
I would very much appreciate any idea how to solve this issue.
By the way - from December I began to receive a notification on the device that an upgrade ROM was downloaded requesting me to click to install. However, when I tried to operate it the process always failed in the first steps (don't remember the error code). If anyone can direct me where to delete the file that was downloaded - it will also be very helpful due to the low free memory on the device.
Thanks in advance for all the help!

I now that for some roms you need to use TWRP recovery, or you will get "no signal".
Try flashing the rom with TWRP recovery and see if that solves your problems.

thanks but no cure yet
Lennyz1988 said:
I now that for some roms you need to use TWRP recovery, or you will get "no signal".
Try flashing the rom with TWRP recovery and see if that solves your problems.
Click to expand...
Click to collapse
Thanks for the advice!
However, it seems that the cure is elsewhere. I had the PhilZ 6, and now converted to TWRP, but issue stays the same.
It appears that the signal is not totally lost, but the network connection can only be maintained for a short while, and only after a reset and when choosing automatic network registration. Soon after the signal disappears.
All other wireless aspects (WIFI, BT) seem to be working fine like before.
I am still breaking my teeth for a solution here...
Thanks.

Why are you installing a rom for the i9505 on a i9505G?
That would probably explain your issues.

You say that your phone is I9505G, but both of those roms are for I9505. Don't ever do such thing. You're lucky you didn't brick your phone. Check your IMEI

thanks for the note
bigkusi said:
You say that your phone is I9505G, but both of those roms are for I9505. Don't ever do such thing. You're lucky you didn't brick your phone. Check your IMEI
Click to expand...
Click to collapse
Indeed I didn't notice the difference and thank you for this very important note.
I would like to elaborate - my phone was bought as a standard i9505, but I installed a clean Google Edition ROM on it and then checked under "Settings"/"About phone" menu to see the Model number "GT-I9505G".
I am now not so sure that this is the true model of I9505G, even though this is the information shown on the phone. If the model relates only to original Google Rom Edition phones then I am wrong and probably confused you.
My IMEI is: 3576********. Can you help me with the true definition and the files that I need to install?

thank you for the important note
Lennyz1988 said:
Why are you installing a rom for the i9505 on a i9505G?
That would probably explain your issues.
Click to expand...
Click to collapse
Indeed I didn't notice the difference and thank you for this very important note.
I would like to elaborate - my phone was bought as a standard i9505, but I installed a clean Google Edition ROM on it and then checked under "Settings"/"About phone" menu to see the Model number "GT-I9505G".
I am now not so sure that this is the true model of I9505G, even though this is the information shown on the phone. If the model relates only to original Google Rom Edition phones then I am wrong and probably confused you.
My IMEI is: 3576**********. Can you help me with the true definition and the files that I need to install?

sarigd said:
Indeed I didn't notice the difference and thank you for this very important note.
I would like to elaborate - my phone was bought as a standard i9505, but I installed a clean Google Edition ROM on it and then checked under "Settings"/"About phone" menu to see the Model number "GT-I9505G".
I am now not so sure that this is the true model of I9505G, even though this is the information shown on the phone. If the model relates only to original Google Rom Edition phones then I am wrong and probably confused you.
My IMEI is:xxx. Can you help me with the true definition and the files that I need to install?
Click to expand...
Click to collapse
First of all know this: You should never reveal your IMEI, it's not safe. Edit your post and hide your Imei number.
Now check again if the Imei that you see inside settings> is the same as the one from the back of the phone, under the battery. If its the same then you are fine. As for the device model, you can also find the model under the battery, and if it says that it's a i9505G than that should clear all the confusion.
My advice would be go back to stock official using ODIN. Grab the latest firmware from sammobile. It's always the safest thing to do, and it should handle all the mess

its a I9505
bigkusi said:
First of all know this: You should never reveal your IMEI, it's not safe. Edit your post and hide your Imei number.
Now check again if the Imei that you see inside settings> is the same as the one from the back of the phone, under the battery. If its the same then you are fine. As for the device model, you can also find the model under the battery, and if it says that it's a i9505G than that should clear all the confusion.
My advice would be go back to stock official using ODIN. Grab the latest firmware from sammobile. It's always the safest thing to do, and it should handle all the mess
Click to expand...
Click to collapse
Many thanks for your message - even though I feel stupid both for not thinking to check "under the hood" and also for publishing the IMEI (now fixed).
It appears that my phone model is I9505. This validates my initial question, how to update the Google Edition ROM (clean version) from 4.3 to 4.42, but avoid the loss of network signal... I will try to take it to a local store and solve my unknown issues with the upgrade by paying a few bucks.
Many thanks anyway!

sarigd said:
Many thanks for your message - even though I feel stupid both for not thinking to check "under the hood" and also for publishing the IMEI (now fixed).
It appears that my phone model is I9505. This validates my initial question, how to update the Google Edition ROM (clean version) from 4.3 to 4.42, but avoid the loss of network signal... I will try to take it to a local store and solve my unknown issues with the upgrade by paying a few bucks.
Many thanks anyway!
Click to expand...
Click to collapse
My last guess is that you are using an incorrect modem. Are you still on the old bootloader?
If you are already on the new bootloader, just flash the latest modem available. If it is correct that you have XXUBMH1, then you are using a modem that is to old for 4.4.2.

this is very true
Lennyz1988 said:
My last guess is that you are using an incorrect modem. Are you still on the old bootloader?
If you are already on the new bootloader, just flash the latest modem available. If it is correct that you have XXUBMH1, then you are using a modem that is to old for 4.4.2.
Click to expand...
Click to collapse
I think that this is the correct problem identification and that my modem file is not updated for 4.42.
I tried to flash the updated modem file for XXUBMH1 version (in this link: http://forum.xda-developers.com/showthread.php?t=2192025), but this did not solve the problem (even after flashing it twice).
Could I flash a different modem file than the one set for the phone base version which I have (or do I risk bricking my device)? and does the base version change after installing the new ROM (I forgot to check this after the new ROM was installed)? If yes then I will re-install it and flash the new modem file which should solve the problem.
Thanks for helping out.

Which modem did you flash? And are you on the old or new bootloader?

Samsung S5 - Lollipop - can i downgrade back to KitKat

Hi Guys,
I stupidly got excited and installed the official Lollipop (S5 on THREE UK network) update when i was notified.
BUT...
I want to go back to KitKat as i preferred it (i wont go into reasons why)
Is there a downgrade path for me, either officially or unofficially?> I dont think there is at the moment.
Thanks guys!

Yep, this forum is literally packed with instructions on how to do it, a simple search will bring up what you need

hi thanks, i thought with the new protected bootloader i didnt think it possible.
this is what i read:
Note: The G900FXXU1BNL9 Android 5.0 Lollipop update comes with a protected bootloader it is clearly emphasize that the “SE for Android Status – Enforcing” that might cause issues when you try to downgrade to the old software updates. This also applies if you are planning into rooting and installs any custom recovery and any unsigned firmware once you are on Android 5.0 Lollipop , so please be aware with that.

manikm303 said:
hi thanks, i thought with the new protected bootloader i didnt think it possible.
this is what i read:
Note: The G900FXXU1BNL9 Android 5.0 Lollipop update comes with a protected bootloader it is clearly emphasize that the “SE for Android Status – Enforcing” that might cause issues when you try to downgrade to the old software updates. This also applies if you are planning into rooting and installs any custom recovery and any unsigned firmware once you are on Android 5.0 Lollipop , so please be aware with that.
Click to expand...
Click to collapse
Yesterday I tried out AllianceROM 6.0 and a few hours ago I went back to 4.4.2 'cause I liked it better than Lollipop. Here's what I did :
1. Enter Download Mode and flash STOCK 4.4.2 KitKat firmware in Odin (I used 3.10.6) and let it start booting.
2. It won't boot, this is normal (I panicked when this happened though ).
3. Go to recovery and factory reset/wipe data your phone.
4. Now hit reboot in recovery and your phone will boot up again (YAY :sun.
5. OPTIONAL : If you've made a nandroid backup before going to 5.0 you can now flash TWRP and restore it over your STOCK 4.4.2 KitKat firmware.
Hope I helped Let me know if it works out for you!

SUCCESS!!!
All sorted.
The hardest part was finding a link to the rom. sammobile kept giving me a gateway 502 error.
im now back to kitkat, AND no THREE UK rubbish.

manikm303 said:
SUCCESS!!!
All sorted.
The hardest part was finding a link to the rom. sammobile kept giving me a gateway 502 error.
im now back to kitkat, AND no THREE UK rubbish.
Click to expand...
Click to collapse
Lol.....so which firmware did you flash? I'm with 3 as well......though for me, all the 3 c**p was frozen with TiBu as soon as I rooted (along with 100+ other 'system' apps too)......I don't want/need all that knox/Samsung/Google rubbish either.......lol
Sent from my rooted kn0x0 SM-G900F S5

I used a stock Samsung 4.4.2 btu mate...took me forever to find a good link though
Still got the Samsung rubbish on it though but I prefer an official rom to a 3rd party one.

Guide me Please
manikm303 said:
I used a stock Samsung 4.4.2 btu mate...took me forever to find a good link though
Still got the Samsung rubbish on it though but I prefer an official rom to a 3rd party one.
Click to expand...
Click to collapse
Okey so i want to downgrade mine s5 from Lolipop to Kitkat 4.4.2. But i wonder if i breaks my varanty and can you make like an min guide and add the links you used also please
Would be really helpful since i'm not sure on where to download the things required. And can i get the Stock samsung 4.4.2, whitout messing up anything, incase i turn my phone in for repairs some time and what not. (cause they can complain that you have touched up stuff in the programs ect )
i appriciate any help peace

answer
hey guys i just followed this tutorial to downgrade it was so easy took several minutes now im running kitkat again yaaay
https://www.youtube.com/watch?v=glNRCuH4Yyw

Flash new firmware

Hey all!
So, I've got a Note 3 SM-N9005 but I've got this issue. When I try to update my Kitkat to Lollipop it says "Your device have been modified, Software updates are not available". I did have it rooted around a year ago and when I click 'Status' at the device info screen, it says 'modified', so I guess that's the issue.
Either way, I'd like Lollipop since I've heard it can solve the bad wifi connection issue, but I have no clue on how to install the new firmware safe and sound on my Note 3.
Does someone have any tips for me on where to find the newest stock firmware and how to flash it on my device? Or how to remove the 'Modified' status so I can get the update over the air?
Thanks in advance!
P.s. My Knox isn't void, it still says 0x0

Google ?

Dejan Sathanas said:
Google ?
Click to expand...
Click to collapse
Yeah I read a lot already, but most of it is dated back at least a few months. And I thought, since this is an expert forum.
Should I just backup everything (like put everything on my computer and use some software to backup game data + sms data etc.) and use Kies? Or should I use Odin and download stock firmware from Sammobile? I'm really not an expert and I don't want to **** it up and brick my phone.

Have a look in the developer section, there are several different custom ROM you can use, I currently have the Phronesis ROM on my Note3 it's a Lollipop Note5 ROM and it is working very good with all the Note5 features such as screen note on lock screen etc.

hi, backup all to your pc and download stock rom and flash with odin or custom rom, but if you want ota flash stock

A total newbie flasher needs help

Hi.. I'm in way over my head trying to install a more debloated Rom than the original stock. Unfortunately I didn't succeed very well.
I tried two different ROMS and both of them turned the Sim off and on every second or so. Lots of *pling* noises followed by a message that the Sim card was or wasn't present. It changed so much back and forth that I didn't even get a chance to enter the pin. I belive it is because of some combabillity issues between the rom and baseband/radio version
This lead me to the question: How do I know what rom and baseband would be the most suited for me? I'm living in Denmark (nordic country), but I simply can't figure what rom that is compatible with what baseband.

Boot into Odin mode and verify the model number. Then go to Sammobile.com, download a rom for your country,and install it with Odin.
Did you buy the phone in the country where it is being used?

came99 said:
Hi.. I'm in way over my head trying to install a more debloated Rom than the original stock. Unfortunately I didn't succeed very well.
I tried two different ROMS and both of them turned the Sim off and on every second or so. Lots of *pling* noises followed by a message that the Sim card was or wasn't present. It changed so much back and forth that I didn't even get a chance to enter the pin. I belive it is because of some combabillity issues between the rom and baseband/radio version
This lead me to the question: How do I know what rom and baseband would be the most suited for me? I'm living in Denmark (nordic country), but I simply can't figure what rom that is compatible with what baseband.
Click to expand...
Click to collapse
I noticed you'd posted a duplicate thread, I'm guessing it was by accident but I've removed it for you
Regards
Sawdoctor

Sorry if what I'm asking is obvious, but when I install a custom rom, I also need to make sure I install a compatible radio for my area, right?
Sammobile is only stock ROMS, right? And I'm trying to debloat her phone. So when installing a custom rom from this forum and either the reception is bad, it doesn't register Sim card properly or the like.. It might be because I need another baseband than the one that came with the rom right? And what do I need to look for in that regard?
Sorry, but I find it pretty complicated.

I recommend flashing a completely stock ROM, set it up, and make sure everything is working properly. If it doesn't work properly on a stock ROM, it is unlikely it will work properly on a custom ROM.
I find it best to run the latest bootloader and modem regardless of which ROM will be used with the phone.
Problems can sometimes occur when flashing current ROMs over old bootloaders and modems.

audit13 said:
I recommend flashing a completely stock ROM, set it up, and make sure everything is working properly. If it doesn't work properly on a stock ROM, it is unlikely it will work properly on a custom ROM.
I find it best to run the latest bootloader and modem regardless of which ROM will be used with the phone.
Problems can sometimes occur when flashing current ROMs over old bootloaders and modems.
Click to expand...
Click to collapse
Thank you for the already helpful reply.
The thing you say about always flashing newest modem regardless of rom, is very helpful. I didnt even know you could do that. But my problem persist:
I already flashed back to stock, and it runs fine. SO far so good. The problem is that out of 16 GB, the bloatware is justing taking up to much space. But the last two rom I tried both had problems recognising the SIM card (toggled present/not present all the time).
Thats not the case on stock.. So how do I find the proper modem for my phone to use with a custom rom?
I keep seeing a link to sammobile, but all I can find is the bloated stock rom (or I dont know what to look for). Can I grab just the modem somewhere?
When installing a custom rom, it changes the current modem right? AFAIK I have to flash the proper modem afterwards, right?
And therein lies my problem: I dont know how to find the most suited one for my country (which is denmark). And the one that comes with the roms seems to be the wrong ones.
PS: A follow up question: Kernel and baseband/radio/modem is not the same, right? The kernel is not region specific, as the baseband/radio/modem, right?

came99 said:
Thank you for the already helpful reply.
The thing you say about always flashing newest modem regardless of rom, is very helpful. I didnt even know you could do that. But my problem persist:
I already flashed back to stock, and it runs fine. SO far so good. The problem is that out of 16 GB, the bloatware is justing taking up to much space. But the last two rom I tried both had problems recognising the SIM card (toggled present/not present all the time).
Thats not the case on stock.. So how do I find the proper modem for my phone to use with a custom rom?
I keep seeing a link to sammobile, but all I can find is the bloated stock rom (or I dont know what to look for). Can I grab just the modem somewhere?
When installing a custom rom, it changes the current modem right? AFAIK I have to flash the proper modem afterwards, right?
And therein lies my problem: I dont know how to find the most suited one for my country (which is denmark). And the one that comes with the roms seems to be the wrong ones.
PS: A follow up question: Kernel and baseband/radio/modem is not the same, right? The kernel is not region specific, as the baseband/radio/modem, right?
Click to expand...
Click to collapse
Custom ROMs can't change your modem, they can't write to those partitions.
In other words, your modem will be the same no matter what. The only way to change it is to flash the appropriate modem files or an actual stock ROM.

SO with the stock rom working now, the modem/rom combination would not be the culprit if something doesnt work afterwards?
What could have been the issue with the sim card connecting and disconnecting every second on the other rom I tried? (Iperium/Imperial something)

came99 said:
SO with the stock rom working now, the modem/rom combination would not be the culprit if something doesnt work afterwards?
What could have been the issue with the sim card connecting and disconnecting every second on the other rom I tried? (Iperium/Imperial something)
Click to expand...
Click to collapse
What I said is that a custom ROM can't change your modem. But that doesn't mean it can't be affected by your modem.
You may want to read Imperium ROM's install instructions very carefully, cuz I'm pretty sure you missed something important.

Doh.. You might be right.. Ill try flashing the tar files in Odin.
But I just recently got my phone to behave when connecting on Odin.. It also connected back and forth all the time. Putting a USB hub in the middle solved it though (and made it possible to revert to stock). Any idea wht that was about? I reckon either some driver or USB power problem? But Im really fumbling understanding it all, and when it acts up at the same time, even the most simple problems can be hard to see through (because there is always the uncertainty that I misunderstood something basic)..
Just having this conversation helped me understand a lot better how the ROMs and modem is connected (or more precise: How they are not).
And I actually may have had the right baseband all along (Nordic Countries). I will know when I tried flashing the rom again.
Thank you very much

It doesn't matter where you are from, the phone should work with any baseband in any country.
The thing is that some ROMs (like Imperium here) may require a different modem to function properly. In this case, it may require the PG1 modem (listed in the Imperium thread) to solve your problems.

Before flashing a stock ROM, confirm the model # in download mode.
If you want a debloated stock ROM, you could flash a stock ROM, flash TWRP recopvery, flash supersu for root, and use Titanium Backup to freeze or uninstall apps.

So right now I tried flashing the Resurrection Remix ROM, but it wont make any calls (a voice just says that the number cant be reached, even though I know the numbers exist). What could be the case there?

The modem and bootloader may be too old.

can it also be to new?
I have consulted the below site several times, but the link is dead to the page where I can look up what modem to use.
Can someone please point me in the right direction of which to use?

This site: http://forum.xda-developers.com/showthread.php?t=2192025
What modem should I choose for my phone? Living in Denamrk and trying with the ressurection remix rom? I tried 3 different of the modems starting with XX but all have the same problem: I cant make any calls. It just says that "there isnt any members on the selected number".
Making calls works fine on stock rom

came99 said:
This site: http://forum.xda-developers.com/showthread.php?t=2192025
What modem should I choose for my phone? Living in Denamrk and trying with the ressurection remix rom? I tried 3 different of the modems starting with XX but all have the same problem: I cant make any calls. It just says that "there isnt any members on the selected number".
Making calls works fine on stock rom
Click to expand...
Click to collapse
The ones linked in the Imperium ROM thread are the newest.
And no, it can't be too new.
It's probably something related to your phone model not being fully supported by the ROM.
JDCTeam ROMs should work, because they support a wide range of S4 models.

I got stock rom to work (again again)
And now I managed to flash the JDC Team you recommended and still having the baseband from the stock rom (Which were able to make calls)
But whatyaknow.. I STILL cant make outgoing calls on the custom roms! What in the world can be the problem? I spent the whole day on this.

.. I should be able to make outgoing calls without flashing Gapps, right?

Yes, you should be able to make calls without gapps.
You flashed the latest stock rom and confirmed everything works?
You confirmed the model number in download mode?

Uncommon behavior when flashing custom ROM - Please help :)

First of all hello to everyone!
I have quite weird problem:
I have my phone rooted and customized since day one - Installed KitKat, tried some launchers, unlocked UPSM and so on.
It ran flawlessly for nearly 4 years.
Recently, for no particular reason I decided to wipe&refresh it and maybe install some totally custom ROM.
NOW: I can install ROMS like Lineage 14.1, 15.1 or Resurrection Remix 6.0 and they run fine except (yes, You probably guessed it) they mess up baseband and IMEI.
I can still revert to original 4.4.2 stock ROM and both baseband and IMEI work fine so i'm not in any "brick panic"
The point is I still want to move to some custom ROM but can't sort out baseband-modem and IMEI problem.
I tried to flash several different modems to no avail - sometimes (totally randomly) IMEI showed up on first boot after flashing but was gone after reboot.
- On my current 4.4.2 stock, IMEI shows up correctly NO MATTER which modem version I flash (is it weird or normal or what?)
- none of modem versions work on Lineage OS nor RR
- SIM card works flawlessly on all other devices and on my current 4.4.2 ROM so it's not damaged.
Is it matter of proper custom ROM+MODEM combination or something else?
Can anyone help to sort it out?
What more information do You need?
Thanks in advance!

Flash the latest lollipop stock firmware to update your bootloader.

Yeah, meanwhile I did flash lollipop an hour ago and it works fine with IMEI and all.
Latest version I could find for my phone was Lollipop 5.0
How can I tell if bootloader is updated?
Can I Flash sole bootloader independently via Odin?

Mikuda said:
Yeah, meanwhile I did flash lollipop an hour ago and it works fine with IMEI and all.
Latest version I could find for my phone was Lollipop 5.0
How can I tell if bootloader is updated?
Can I Flash sole bootloader independently via Odin?
Click to expand...
Click to collapse
Yes you can. Go to this thread https://forum.xda-developers.com/galaxy-note-3/general/bootloader-baseband-bl-cp-samsung-t3582504

Thank You all for help and pointing to right direction!
Taking care of proper bootloader version was the key step that sorted things out.
Now I'm enjoying superlite bloatware free 8.1 oreo with LineageOS 15.1 on great 4 yrs old device.
And it works super smooth. Way better then original 4.4.2.
Now I'm being tempted to push the limits and try 9.0 Pie with LOS 16...

Whenever flashing a stock ROM with Odin, the stock ROM includes a bootloader and modem file.